I'm developing GroundPlane AR Project in iOS Native Environment...

When I run the App I'm developing, sometimes the 3D model rotated incidentally.(Bottom side is facing to front direction).

When I move the model to other location then, it sometimes move with right model(right rotation and location) but sometimes

it move to the location with wrong rotation(As I explained, Bottom side faced to front direction). and It continue...

So I tested with Original ground plane sample,

then the symptom is still there~. sometimes the chair rotates(Bottom side is facing to front direction)

So after that I move the chair then it correct the wrong rotation direction.

I don't know why this is occurred... and the sample ground plane app shows the same symptom...

I want to know how to fix it... Please help...

I attach the bug capture screen.

sorry for my poor english...

Thanks in advance...